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Obras y proyectos

versión On-line ISSN 0718-2813

Resumen

RAMOS C, Alfonso M; TRUJILLO-VELA, Mario Germán  y  PRADA S, Luis Felipe. Descriptive analyses of landslide processes in Bogotá. Obras y Proyectos [online]. 2015, n.18, pp.63-75. ISSN 0718-2813.  http://dx.doi.org/10.4067/S0718-28132015000200006.

In order to understand the processes that trigger landslides and the factors that may influence their generation such as geomorphology and climatology, this paper presents a new database of landslide processes compiledfor Bogotá, constructedfrom technical reports elaborated by the Instituto Distrital de Gestión del Riesgo y Cambio Climático IDIGER (formerly known as FOPAE). This database includes 2208 landslide events that occurred between 1996 and 2013. Because of the many features described in the technical reports, it was necessary to categorize in a systematic way variables like soil type, type of movement, possible cause that triggered the event, ground cover, average inclination of the slope, and the volume of sliding material, in order to condense the largestpossible amount of information. The database allows to infer relationships between precipitation and the occurrence of landslides in Bogotá. Analysis of the database shows a strong relationship between monthly rainfall and monthly amount of landslides, marked by a bimodal regime with the maximum recorded occurrence of slides between April-May and November-December. The time series of slides shows a hint of relationship with the Oceanic Niño Index ONI series, since for some Niña periods (more rain) the amount of recorded landslides increases. In addition, the correlogram of the time series of landslides is calculated, showing that the occurrence of landslide events may be associated with the reactivation of events that previously took place (six months in the past).

Palabras clave : landslides in Bogotá; descriptive analysis of landslide occurrence; correlation ONI-landslides.

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